textproduct: Quad Cities

KEY MESSAGES

- Quiet stretch of weather through midweek, owing to surface high pressure over the Great Lakes Region; mostly clear skies, temperatures in the 80s, and light winds through Wednesday.

- Blocking pattern breaks down Thursday/Friday, with warm advection resulting in temperatures and humidity trending up late in the week.

- Near daily chances for storms will be seen Friday onward. Too soon to determine a severe threat, but a few stronger storms and localized beneficial heavy rainfall cannot be ruled out Friday through Sunday.

SHORT TERM /THROUGH WEDNESDAY NIGHT/

Issued at 145 PM CDT Tue Jun 2 2026

High pressure remains in control through midweek leading to warm days, cool nights, and low humidity with dry air in place. After highs in the 80s today, we'll drop back into the 50s for lows tonight. Winds will turn to more of southerly direction on Wednesday, leading to warmer nighttime temps into the upper 50s to lower 60s.

LONG TERM /THURSDAY THROUGH TUESDAY/

Issued at 145 PM CDT Tue Jun 2 2026

Thursday-Saturday...The trough that has been stalled out over the Northern Rockies finally moves into the Northern Plains and south- central Canada, kicking the ridge over the Great Lakes southeastward and pulling a shortwave in the subtropical jet northeastward into the Central Plains. Low pressure will deepen along the Front Range and near the North Dakota-Canada border as our winds shift out of the south, advecting in warmer, moist air from the Gulf. We will see the best moisture work into the area Friday/Friday night, where guidance brings PWATs as high as 1.85" into the area. Thus, quite a bit of moisture will be present, making it feel humid late week into the weekend (with dewpoints in the mid 60s to near 70 F). As a cold front progresses across the Northern Plains and bands of shear vorticity are advected into Upper Mississippi River Valley, rain chances increase to 50-70% Friday into Saturday. There is uncertainty on precipitation amounts through Saturday due to expected scattered nature of the showers and storms. Given such high PWATs in place (nearing the 90-99th percentile of climatology), any storm will have the potential to drop efficient and heavy rainfall, even if brief. With increasing moisture, cloud cover and convective debris will lead to some uncertainty on high temperatures. These conditions can keep temperatures in the low- mid 80s going into the weekend, but there will be the potential for upper 80s to near 90 if cloud cover is not as widespread. Either way, the increase in dewpoints will make it feel quite humid out there. Overnight temperatures will also remain above seasonal norms.

In terms of severe weather during that timeframe, the displaced trough to the north should limit the surface to 500mb effective bulk shear to 30 kts or less. While this isn't the most favorable environment for severe storms, a few stronger storms cannot be ruled out.

Sunday...Another shortwave in the subtropical jet stream is pulled northeastward into the Central Plains by a longwave trough digging into the western CONUS. The EC suite continues to keep precipitation chances over the area, but there is uncertainty amongst long range guidance. NBM guidance continues to hold onto slight-chance PoPs, especially in the afternoon hours, where diurnally driven convection is possible.

AVIATION /00Z TAFS THROUGH 00Z WEDNESDAY/

Issued at 605 PM CDT Tue Jun 2 2026

Dry east winds will turn to the southeast and south during the day Wednesday, as high pressure begins to move east of the region. This high will provide at least one more dry, VFR day with only a few high clouds and excellent visibility to the area.

DVN WATCHES/WARNINGS/ADVISORIES

IA...None. IL...None. MO...None.